Soushitsu no Hibi ~Suimin'yaku Hen~

Kazuki Takashiro, a young boy, had feelings for his female cousin Aki Teshigawara.
Even though he was teased at school by a classmate from a certain country, he was happy because Aki was by his side. It was a time of happiness.

But then one day, with the arrival of bully Takeshi, those days were demolished.

[From DLsite English]